VAN 211: Veterinary Histology and Embryology (2+2)

URETHRA

Male:

• The urethra is a long mucous tube, which extends from the urinary bladder to the glans penis.
• It consists of pelvic and extrapelvic or penile part. The pelvic part is lined by transitional epithelium.
• The vas deferens, seminal vesicles, prostate glands are opening into the urethra in its initial part and the ducts of bulbourethral glands open further behind.
• In the bull and boar, the pars disseminata of prostate gland forms a glandular layer in the wall of entire pelvic urethra whereas in horse and carnivore, they are in the form of scattered small glands.
• The penile part of urethra is also lined by transitional epithelium, which changes to stratified squamous epithelium near its termination. In the stallion and boar scattered glands may be present as in the pelvic part.